sanitize.py

import re

safe = "abcdefghijklmnopqrstuvwxyz01234567890-_ .,"
tomap = (
    "éàèùçâêîôûëïüąćęłńóśźżříšžčýůňúěďáéäüößœ",
    (*"eaeucaeioueiuacelnoszzriszcyunuedae", "ae", "ue", "oe", "ss", "oe"),
)
map = {
    **{c: c for c in safe + safe.upper()},
    **{s: d for (s, d) in zip(*tomap)},
    **{s.upper(): d.upper() for (s, d) in zip(*tomap)},
}


def sanitize(s):
    return re.sub("_+", "_", "".join([map[c] if c in map else "_" for c in s]))


if __name__ == "__main__":

    def test(s):
        print(f"{s} --> {sanitize(s)}")
        print(f"{s.upper()} --> {sanitize(s.upper())}")

    test("Pójdźże, kiń tę chmurność w głąb flaszy!")
    test("Příliš žluťoučký kůň úpěl ďábelské ódy")
    test("Fix, Schwyz! quäkt Jürgen blöd vom Paß")
    test("HellOO 😂🤣--😍🥰 there, you!.md")
    test("Voix ambiguë d’un cœur qui au zéphyr préfère les jattes de kiwis")